Intersubband Edge Singularity in Metallic Nanotubes

Abstract

Tunneling density of states of both the massless and massive (gapped) particles in metallic carbon nanotubes is known to have anomalous energy dependence. This is the result of coupling to multiple low-energy bosonic excitation (plasmons). For both kinds of particles the ensuing effect is the suppression of the density of states by electron-electron interactions. We demonstrate that the optical absorption between gapless and gapped states is affected by the many-body effects in the opposite way. The absorption probability is enhanced compared with the non-interacting value and develops a power-law frequency dependence with the exponent -0.2 for typical nanotubes.

4 pages, 1 figure (final version, discussion of Sommerfeld factor and Ref. 11 added)

References in corpus (3)

• Universal theory of nonlinear Luttinger liquids
• Dynamic response of one-dimensional interacting fermions
• Wigner crystal physics in quantum wires

Cited by in corpus (6)

• One-Dimensional Quantum Liquids: Beyond the Luttinger Liquid Paradigm
• Fundamental Optical Processes in Armchair Carbon Nanotubes
• Structure factor of interacting one-dimensional helical systems
• Effects of Electron-Electron Interactions on Electronic Raman Scattering of Graphite in High Magnetic Fields
• Manifestations of electron interactions in photogalvanic effect in chiral nanotubes
• Breakdown of classical electrostatics in the depolarization of quantum wires and nanotubes